How to remove privacy settings for files and folders in Catalina?

It seems to be simple, but how to remove the given privacy settings for files and folders? I have some double mentions which I would like to remove!

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So how to achieve this, when the + / - control buttons are disabled?


In short, those buttons don't work and there's no easy way of adding, deleting, or modifying the contents of that list.

For the difficult way, have a look at this answer: Add apps to "Files and Folders" permissions?